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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb947c05d2e3d78e69b0e3523c4bb545bb7479b49ed90d4915aed8357b32323' 
  AND token = 'TZNEnD03stlHxfPKO0mcrHD13/BGIOf35AF0ePQenF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}